<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
  </head>
  <body>
    <script>
      // const test = 'xxx'
      // const obj = {
      //   name: 'zs',
      //   yyy: 18,
      //   [test]: 123, // ['xxx']: 123
      // }
      // console.log(obj)

      function fn(x, y) {
        return x + y
      }
      function fn(x) {
        return (y) => {
          return x + y
        }
      }
    </script>
  </body>
</html>
